from flask import render_template, session, current_app, abort, jsonify, request
from flask import g
from info import constants, db
from info.models import User, News, Comment, CommentLike
from info.utils.common import user_login_data
from info.utils.response_code import RET
from . import news_blu


@news_blu.route('/comment_like', methods=['POST'])
@user_login_data
def comment_like():
    """
    评论点赞
    :return:
    """
    user = g.user
    if not user:
        return jsonify(erron=RET.SESSIONERR, errmsg='用户未登录')

    # 1、取到请求参数
    comment_id = request.json.get('comment_id')
    # news_id = request.json.get('news_id')
    action = request.json.get('action')

    if not all([comment_id, action]):
        return jsonify(erron=RET.PARAMERR, errmsg='参数不全错误')
    if action not in ['add', 'remove']:
        return jsonify(erron=RET.PARAMERR, errmsg='点赞参数错误')

    try:
        comment_id = int(comment_id)
        # news_id = int(news_id)

    except Exception as e:
        current_app.logger.error(e)
        return jsonify(erron=RET.PARAMERR, errmsg='参数错误')

    # 获取到要点赞的评论模型
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(erron=RET.DBERR, errmsg='数据查询错误')

    if not comment:
        return jsonify(erron=RET.NODATA, errmsg='评论不存在')

    if action == 'add':
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()

        if not comment_like_model:
            # 点赞评论
            comment_like_model = CommentLike()
            comment_like_model.user_id = user.id
            comment_like_model.comment_id = comment.id
            db.session.add(comment_like_model)
            comment.like_count += 1

    else:
        # 取消点赞
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()

        if comment_like_model:
            db.session.delete(comment_like_model)
            comment.like_count -= 1

    try:
        db.session.commit()

    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(erron=RET.DBERR, errmsg='数据库操作失败')

    return jsonify(erron=RET.OK, errmsg='OK')


@news_blu.route('/news_comment', methods=['POST'])
@user_login_data
def comment_news():
    """
    评论新闻或者回复某条新闻下指定的评论
    :return:
    """
    user = g.user
    if not user:
        return jsonify(erron=RET.SESSIONERR, errmsg='用户未登录')

    # 1、取到请求参数
    news_id = request.json.get('news_id')
    comment_content = request.json.get('news_comment')
    parent_id = request.json.get('parent_id')

    # 2、判断参数
    if not all([news_id, comment_content]):
        return jsonify(erron=RET.PARAMERR, errmsg='参数错误')
    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(erron=RET.PARAMERR, errmsg='参数错误')
    # 查询新闻，并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(erron=RET.DBERR, errmsg='数据查询错误')
    if not news:
        return jsonify(erron=RET.NODATA, errmsg='为查询到新闻数据')

    # 3、初始化一个评论模型，并且赋值
    comment = Comment()
    comment.news_id = news_id
    comment.user_id = user.id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id

    # 添加到数据库
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)

    return jsonify(erron=RET.OK, errmsg='OK', data=comment.to_dict())


@news_blu.route('/news_collect', methods=['POST'])
@user_login_data
def collect_news():
    """
    收藏新闻
    1、接受参数
    2、判断参数
    3、查询新闻，并判断新闻是否存在
    :return:
    """
    user = g.user
    if not user:
        return jsonify(erron=RET.SESSIONERR, errmsg='用户未登录')

    # 1、接受参数
    news_id = request.json.get('news_id')
    action = request.json.get('action')

    # 2、判断参数
    if not all([news_id, action]):
        return jsonify(erron=RET.PARAMERR, errmsg='参数错误')

    if action not in ['collect', 'cancel_collect']:
        return jsonify(erron=RET.PARAMERR, errmsg='参数错误')

    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(erron=RET.PARAMERR, errmsg='参数错误')

    # 3、查询新闻，并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(erron=RET.DBERR, errmsg='数据库查询错误')
    if not news:
        return jsonify(erron=RET.NODATA, errmsg='未查询到新闻数据')

    # 4、收藏以及取消收藏
    if action == 'cancel_collect':
        if news in user.collection_news:
            user.collection_news.remove(news)

    else:
        if news not in user.collection_news:
            user.collection_news.append(news)

    return jsonify(erron=RET.OK, errmsg='操作成功')


@news_blu.route('/<int:news_id>')
@user_login_data
def news_detail(news_id):
    """
    新闻详情模块
    :return:
    """
    # 查询用户登录信息
    # user_id = session.get('user_id', None)
    # user = None
    # if user_id:
    #     try:
    #         user = User.query.get(user_id)
    #     except Exception as e:
    #         current_app.logger.error(e)
    user = g.user

    # 右侧新闻点击排行逻辑
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
        # print(news_list)
    except Exception as e:
        current_app.logger.error(e)
    # 定义一个空字典列表，里面装的就是字典
    news_list_dict = []
    # 遍历对象，将对象的字典添加到字典列表中
    for news in news_list:
        news_list_dict.append(news.to_basic_dict())

    # 查询新闻数据
    news = None
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)

    if not news:
        abort(404)

    # 更新新闻点击次数
    news.clicks += 1

    is_collected = False

    if user:
        # 判断用户是否收藏当前新闻，如果收藏 is_collected = True
        # collection_news后面可以不用加all，因为sqlalchemy会在使用的时候去自动加载
        if news in user.collection_news:
            is_collected = True
    # 查询新闻评论数据
    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)

    comment_like_ids = []

    if user:
        try:
            # 查询当前用户在当前新闻里面都点赞了哪些评论
            # 1、查询出当前新闻的所有评论（[COMMENT]）取到所有的评论id [1,2,3,4]
            comment_ids = [comment.id for comment in comments]
            # 2、再查询出当前评论中哪些评论被当前用户所点赞 ([CommentLike]) 查询comment_id 在第1步的评论id列表内的所有数据 & CommentList.user_id = g.user.id
            comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),
                                                     CommentLike.user_id == g.user.id).all()
            # 3、取到所有被点赞的评论id，第2步查询出来是一个 [CommentLike] --> [3, 5]
            comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]
        except Exception as e:
            current_app.logger.error(e)

    comment_dict_list = []

    for comment in comments:
        comment_dict = comment.to_dict()
        # is_lick=False 代表没点赞
        comment_dict['is_like'] = False
        # 判断当前遍历到的评论是否被当前登录用户所点赞
        if comment.id in comment_like_ids:
            comment_dict['is_like'] = True
        comment_dict_list.append(comment_dict)

    data = {
        'user': user.to_dict() if user else None,
        'news_list_dict': news_list_dict,
        'news': news.to_dict(),
        'is_collected': is_collected,
        'comments': comment_dict_list
    }
    return render_template('news/detail.html', data=data)
